Read it through once

It is said that during one of the grand eruptions of Vesuvius it discharged massy rocks weighing many tons a thousand feet into the air, its vast jets of smoke and steam ascended thirty miles toward the firmament, and clouds of its ashes were wafted abroad and fell upon the decks of ships seven hundred and fifty miles at sea! I will take the ashes at a moderate discount, if any one will take the thirty miles of smoke, but I do not feel able to take a commanding interest in the whole story by myself.